Cities like Singapore, San Francisco and Helsinki are using digital technologies to solve these and other problems, in order to make life better for residents. In Glasgow, streetlights with smart sensors dim when the streets are empty, saving energy and taxpayer dollars. In Barcelona, the government opened up its data sets for use by citizens and businesses, installed free Wi-Fi in streetlights, and has sensors constantly monitoring waste bins, parking spaces, and air quality. When city planners and service providers have access to more accurate and timely data, it creates possibilities to use the city's resources more equitably and efficiently.